Low-profile composite antenna device

A low-profile composite antenna device for vehicles, comprising:

• a base plate fixed to a vehicle and whose longitudinal direction faces a vehicle traveling direction;
• a circuit board arranged on the base plate and having a feeding part for a first element and a feeding part for a second element;
• an antenna cover fitted to the base plate, having a ridgeline part whose longitudinal direction faces the vehicle traveling direction and a side surface part extending from both sides of the ridgeline part, and having a chevron cross sectional shape as viewed from a front side in the vehicle traveling direction;
• a first element like plate housed in the antenna cover, which is arranged at one of left and right sides in the vehicle traveling direction, which is inclined with respect to the base plate as viewed from the front side in the vehicle traveling direction, whose upper end side is arranged in a vicinity of the ridgeline part, and which is connected to the feeding part for the first element of the circuit board to function as an antenna for a first frequency band;
• and
• a second element like plate housed in the antenna cover, which is arranged at the other of the left and right sides in the vehicle traveling direction, whose upper end side is arranged in the vicinity of the ridgeline part with a gap from the first element, which faces the first element from the ridgeline part toward the base plate, and which is connected to the feeding part for the second element of the circuit board to function as an antenna for a second frequency band different from the first frequency band.